Exchange Rate

by Hal Clement

In this classic novella, harried human explorers must try to figure out the lifeways and motivations of some extremely strange and enigmatic alien creatures on one of the strangest planets ever portrayed in science fiction - and do it all before the clock runs out.

Audible Audio

Published November 22, 2000

About the author

Harry Clement Stubbs better known by the pen name Hal Clement , was an American science fiction writer and a leader of the hard science fiction subgenre.

Further details at Wikipedia.